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In this 2021 we can enjoy a high-speed Internet connection at home, through a fiber optic connection and with very affordable internet rates for most people.
Sin embargo, ten years ago in some countries it was hardly possible to think of contracting an Internet service for ADSL at high prices. It was very common to contract an Internet service via coaxial cable, with the help of a cable modem.
At the same time, some companies also offered their Internet service via telephone cable, although it is more expensive but with greater speed in the service.
Digital Subscription Line
Known by its acronym DSL, the Digital Subscription Line is a family of technologies that provide access to the Internet through the transmission of digital data, through a pair of conventional copper wires from the basic or switched telephone network.
The rate of bit transfer of the DSL services normally ranges from 256 kbits/s to 50 Mbit/s in direction to the client, depending on the DSL technology, line conditions and service quality application.
In ADSL, the speed of the ascending flow of data is lower than that of the descending flow, which is why it is designated as an asymmetric service (Asymetric DSL). In the SDSL (Symmetric Digital Subscription Line) services, the rates of descending and ascending data are the same.
Asymmetric Digital Subscription Line
It is a broadband Internet access technology, which implies a higher speed compared to a modem connection in data transfer, ya que el modem utiliza la banda de voz y por lo tanto impide el servicio de voz while se utiliza y viceversa.
This is achieved by means of a modulation of the data signals in a higher frequency band than the one used in conventional telephone conversations.
Over time, telephone companies have implemented improved versions of digital subscription technologies, capable of providing high-quality television and video for telephone pairs, offering voice, data and television services through the denominated «Triple Play».
Fiber Optic
Today, commercial and domestic Internet networks have evolved to fiber optic connections, using laser emission systems. Light waves have a high frequency and the capacity of a signal to transport information increases with frequency.
However, fiber optic technology is not that new, because in its beginnings, LED emitters were used, the same ones that have been in disuse since 2007.
FO local area networks are widely used for long-distance communication, providing transcontinental and transoceanic connections, since an advantage of fiber optic systems is the great distance that a signal can travel before needing a repeater or regenerator to recover its intensity.
Currently, the repeaters of the transmission systems for FO are separated from each other by around 100 kilometers, compared to approximately 1.5 kilometers in the electrical systems.
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